V.06 11/3
Dependencies: FT6206 SDFileSystem SPI_TFT_ILI9341 TFT_fonts
Fork of ATT_AWS_IoT_demo by
RESIZE.cpp
00001 /* 00002 Copyright (c) 2010 Andy Kirkham 00003 00004 Permission is hereby granted, free of charge, to any person obtaining a copy 00005 of this software and associated documentation files (the "Software"), to deal 00006 in the Software without restriction, including without limitation the rights 00007 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 copies of the Software, and to permit persons to whom the Software is 00009 furnished to do so, subject to the following conditions: 00010 00011 The above copyright notice and this permission notice shall be included in 00012 all copies or substantial portions of the Software. 00013 00014 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 THE SOFTWARE. 00021 */ 00022 00023 #include "MODSERIAL.h" 00024 #include "MACROS.h" 00025 00026 namespace AjK { 00027 00028 int 00029 MODSERIAL::resizeBuffer(int size, IrqType type, bool memory_check) 00030 { 00031 // Make sure the ISR cannot use the buffers while we are manipulating them. 00032 NVIC_DisableIRQ(_IRQ); 00033 00034 // If the requested size is the same as the current size there's nothing to do, 00035 // just continue to use the same buffer as it's fine as it is. 00036 if (buffer_size[type] == size) 00037 { 00038 NVIC_EnableIRQ(_IRQ); 00039 return Ok ; 00040 } 00041 00042 // is new buffer is big enough? 00043 if (size <= buffer_count[type]) 00044 { 00045 NVIC_EnableIRQ(_IRQ); 00046 return BufferOversize ; 00047 } 00048 00049 // allocate new buffer 00050 char * newBuffer = (char*)malloc(size); 00051 00052 // allocation failed? 00053 if (newBuffer == (char*)NULL) 00054 { 00055 if (memory_check) 00056 error("Failed to allocate memory for %s buffer", type == TxIrq ? "TX" : "RX"); 00057 00058 return NoMemory ; 00059 } 00060 00061 // copy old buffer content to new one 00062 moveRingBuffer(newBuffer, type); 00063 00064 // free old buffer and reset ring buffer cursor 00065 free((char*)buffer[type]); 00066 00067 buffer[type] = newBuffer; 00068 buffer_size[type] = size; 00069 buffer_in[type] = buffer_count[type]; 00070 buffer_out[type] = 0; 00071 00072 // Start the ISR system again with the new buffers. 00073 NVIC_EnableIRQ(_IRQ); 00074 return Ok ; 00075 } 00076 00077 void MODSERIAL::moveRingBuffer(char * newBuffer, IrqType type) 00078 { 00079 // copy old buffer content to new one 00080 if(buffer_in[type] > buffer_out[type]) 00081 { // content in the middle of the ring buffer 00082 memcpy(&newBuffer[0], (char*)&buffer[type][buffer_out[type]], buffer_count[type]); 00083 } 00084 else if(buffer_in[type] < buffer_out[type]) 00085 { // content split, free space in the middle 00086 // copy last part of the old buffer 00087 int end_count= buffer_size[type] - buffer_out[type]; 00088 memcpy(&newBuffer[0], (char*)&buffer[type][buffer_out[type]], end_count); 00089 00090 // copy first part of old buffer 00091 memcpy(&newBuffer[end_count], (char*)buffer[type], buffer_in[type]); 00092 } 00093 // else old buffer empty 00094 } 00095 00096 }; // namespace AjK ends 00097
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